RFR: 8315761: Open source few swing JList and JMenuBar tests [v2]

[Tejesh R]

On Fri, 8 Sep 2023 10:14:20 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

>> Few closed JList and JMenubar swing tests are open sourced.
>
> Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review comment update

Marked as reviewed by tr (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/15621#pullrequestreview-1621250298